The frequency response of seabed around a suction pile anchor subjected to the mooring force of floating structure was numerically evaluated by taking the seabed characteristics into consideration. The seabed was assumed to be a fluid-saturated poroelastic medium whose behavior is governed by Biot's theory of wave propagation, and the suction pile anchor was modeled as a rigid and hollow cylinder with upper cover. In this paper, the effect of the skirt length of suction pile anchor on both the displacement response of suction pile anchor and that of seabed was investigated from the view point of the permeability of seabed.
Recently, the marine structures tend to be installed in a large water depth, as the development of the coastal zone extends to the offshore. In particular, the mooring system for the offshore structure plays a very significant role in the case of taking the floating system as its structure, where the rock base needed for anchoring of floating structures is not so easy to be secured. It is, in general, difficult to" accurately estimate the response of the mooring system for the offshore structure subjected to the various irregular forces such as winds and flows acting on the mooring system. It is, however, very significant and important in the design of the mooring system for the floating structure form to make a quantitative evaluation of the mooring structure-seabed interaction effect. Based on the application of the end bearing anchor to the weak soil ground or seabed, Takatani et aI. (1991, 1994) have already represented the dynamic responses of both the end bearing anchor and the seabed around it subjected to the mooring force producing by the swing of a ferry boat under the various wind and wave conditions.
